The International Potato Center has 4,500 types of potatoes. They have 3,000 types from Peru. Arsenio walks into the center and randomly picks up a potato. What is the chance that his potato is not one of the types found in Peru?
From your question there are 1500 types of potatoes that are NOT from Peru
1500/4500 is the liklihood it will not be from Peru = 1/3 or 1 out of three chance.